[clang] [clang] Remove separate evaluation step for static class member init. (PR #142713)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic commented:

> or is there more?

No, that's it, basically.  (Except for the C++98 codepath.)

https://github.com/llvm/llvm-project/pull/142713